Stove or furnace.



ITO-788,571. I PATENTED MAY 2, 1905. M. W. WOODBURN.

STOVE 0R FURNACE.

APPLICATION FILED NOV. 18, 1903.

4 2 A l A 5 a i w WITNESSES- EL 3-5. B n NVENTOR {4 71mg. %%m

NITED STATES ratenteca May 2, 1905.

PATENT OFFICE.

MATTHEW W. WVOODBURN, OF DETROIT, MICHIGAN, ASSIGNOR TO THE SIPHON STOVECOMPANY, OF DETROIT, MICHIGAN, A CORPORA- TION OF MICHIGAN.

STOVE OR FURNACE.

SPECIFICATION forming part of Letters Patent No. 788,571, dated May 2,1905.

Application filed November 18, 1903. Serial No. 181,623.

To (.LZZ/ whom it may concern.-

Be it known that I, MATTHEW W 001)- BURN, a citizen of the UnitedStates, residing at Detroit, county of Wayne, State of Michigan, haveinvented a certain new and useful Improvement in Stoves or Furnaces, ofwhich the following is a specification, reference be ing had to theaccompanying drawings, which form a part of this specification.

My invention has for its object to provide certain new and usefulimprovements in stoves and furnaces; and it consists of theconstruction, combination, and arrangement of devices hereinafterdescribed and claimed, and illustrated in the accompanying drawings, inwhich 7 Figure 1 is a View ofv a stove in elevation, showing partsbroken away, illustrating features of my invention. Fig. 2 is a partialvertical section illustrating features of my in vention. Fig. 3 is aplan view of the grate. Fig. 4: is a view in section on line 4; I, Fig.3, certain parts in elevation being omitted. Fig. 5 is aview in sectionon line 5 5, Fig. 3. Fig. 6 is a view in section on the line 6 6, Fig.3. Fig. 7 is a view of parts of the stove in horizontal section. Fig.Sis a view similar to Fig. A, but showing a gas-pipe connection with theshaker.

More particularly, my invention is designed to provide a novelconstruction of the grate whereby air may be admitted thereinto to keepthe grate-bars cool and prevent the grate from being burned out.

My invention also contemplates the general construction and featuresherein described, illustrated, and claimed. 7 p

I have shown in the accompanying drawings my invention as applied to astove, the drawings and the following description thereof serving toillustrate my invention, the invention in its essential features beingapplicable, however, not only to stoves, but to ranges, furnaces, andanalogous constructions where a grate is employed or where a tire-potand magazine-section of similar construction may be utilized. Moreover,I have shown, as

without into and through the air-chamber of the stove or analogousdevices, whereby the air is heated and passed into the combustionchamberof the stove, causing thereby a great saving of fuel over otherconstructions for like purposes.

I carry out my invention as follows:

In the drawings. a represents the inclosing shell of a stove in which islocated a hollow shakeable grate o, the grate being supported in anysuitable manner to be shaken, as upon a ledge 0 of a lire-pot (Z. Thegrate may be constructed in any suitable manner to permit theintroduction thereinto of cold air for the purpose of preserving thegrate from destruction by the intense heat constantly surrounding it. Asindicated in the drawings, the grate may be made of two chamberedplates, (indicated by the numerals 1 and 2.) For eonvenience ofconstruction I do not, however, limit myself to the particular manner ofconstruction of the body of the grate, as a hollow grate of any suitableconstruction is contemplated within thescope of my invention, the gratebeing arranged so as to be shaken. The grate is provided with a hollowshakerhandle communicable with the interior airchamber of the grate. Thehollow shakerhandle is indicated at a and may be formed integral withthe body of the grate or otherwise, as may be preferred. The hollowshakerhandle is a fixed part of the grate and projects outward from thebody of the grate, so that it may be readily engaged in any suitableman- 5 its durability. The grate may be constructed 4 low shaker-handle,

ner for shaking the grate. particularly in Fig. 7, the device isprovided with a door-plate, (indicated at f,) the plate formed with anelongated opening through which the outer end of the shaker-handleprojects, the plate permitting the movement of the shaker-handle to andfro to shake the coal. Over the plate f Ilocate a door j, constructed toclose about the outer end of the shakerhandle, so as when in closedposition to practically shut off the entrance of air through the openingin the plate into the interior of the stove and compelling the air toenter through the open end of the shaker-handle. To this end a door ispreferably formed with open-work (indicated at g) to conceal the outerend of the shaker-handle. Said door is shown hinged, as at g, so thatthe doormay be swung open when it is desired to shake the grate.

As above observed, I prefer to construct the stove with provision for adowndraft, as indicated by the arrows, a double-acting damper, asindicated at h, and a feed-door at 2'. Above the fire-pot, which ispreferably made flaring toward its upper edge, I locate amagazinesection A, diverging from the top thereof toward its lower edge.It is readily understood that in the use of soft coal it has beendifficult in employing the same with ordinary magazine-stoves on accountof the expansion of the soft coal when heated; but by expanding themagazine-section at the lower end thereof to give room for suchexpansion the clogging of the coal in the magazine is effectuallyprevented.

Among the advantages of this construction are the ability to use softcoal and make it last as long and do as much heating, ton for ton, aswhen hard coal is employed. In consequence of the perfect combustionsecured the smoke and gases are consumed and a very considerable savingis effected in the cost of fuel. Stoves and analogous constructionsembodying these improvements combine a superior degree of heatingcapacity, as well as great economy. By utilizing adowndraft the productsof combustion are constantly charged with fresh oxygen, and the productsof combustion being commingled with air are compelled to pass down intoand through the fire zone, by which perfect combustion is secured, and aproportionate volume of heat is thus derived from the products ofcombustion which in other constructions of analogous devices are liableto be unconsumed and wasted.

, It will be'apparent that a constant circulation of fresh air isprovided through the grate, the air when passed through the grate beingdischarged into the fire to aid combustion, while at the same time thegrate can be shaken like any ordinary grate without interrupting theflow of oxygen or air therethrough. This constant circulation of airthrough the grate prevents its becoming overheated and insures As shownmore within the scope of my invention so as to constitute a combinedcoal and gas burner, and a gas-supply pipe m might be connected with thehollow shaker. The, grate may be constructed in any desired manner forthe exit of the admitted air or the gases admitted thereinto. By the useof a downdraft it will be apparent that fire burns not so much up intothe coal as away from it, preventing waste, the coal falling down uponthe fire-bed as the lower portion of the coal is consumed. By thisconstruction soft coal may be made to last quite as long and to do asefiicient service as an equal weight of hard coal when used in stoves,furnaces, and the like of ordinary construction. The feature of preserving a shakeable grate by a constant air-current therethrough isobviously a matter of much importance.

The burner is shown with perforations a for the emission of air or gasfrom the burner into the combustion-chamber.

It will be understood that in a downdraftstove provided with my improvedgrate the air supplied by the downdraft passes downward through the fuelin the combustion-chamber, finding its way from the top of the fuelbeddownward therethrough, and passes out of the combustion-chamber throughthe openings (indicated at 50) in the grate, the air passing thence frombeneath the grate up through the flue y and into the chimney.

What I claim as my invention isi. In a stove or analogous construction ahollowhorizontally-shakeable grate construct ed with openingstherethrough for the passage of a downdraft current through the grate,and provided with a hollow shakerhandle engaged therewith through whichair may be supplied to circulate through the grate, said stove having asurrounding shell provided with a door-plate through which said handleprojects, andadoor closing closely about the outer end of the handleconstructed to permit the entrance of air into the shakerhandle tocirculate through the grate, but not into the body of the stove.

2. A downdraft stove or analogous construction provided with a hollowhorizontally-shakeable grate constructed with openings therethrough forthe passage of adowndraft-current through the grate and having a hollowshaker handle engaged therewith through which air may be supplied tocirculate through the grate, said stove having a surrounding shellprovided with a door-plate through which said handle projects, and adoor closing closely about the outer end of the handle constructed topermit the entrance of air into the shaker handle to circulate throughthe grate but not into body of the stove.

3. In a stove or analogous construction a hollow shakeable grateprovided with a hola surrounding shell provided with a door-platethrough which said specification in the presence of two subscribhandleprojects, and a door closing closely ing witnesses.

about the outer end of the handle constructed r r to permit the entranceof air into the shaker- MALTHEW WOODBURN' 5 handle to circulate throughthe grate, but not Witnesses:

into body of stove. N. S. WRIGHT, In testimony whereof I have signedthis D. Z. OURTIss.

